RECORD: Darwin, C. R. 1873.08.02. Facts bearing on the Morphia experiments. CUL-DAR55.121-122. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 1.2023. RN1

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volumes CUL-DAR 54-61 contain material for Darwin's book Insectivorous plants (1875).


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Aug 2d. 73 Facts bearing on the Morphia experiments

Infusion of raw & roast meat acts apparently as instantly & so quickly as saliva on single glands— so that bits of meat ought to act to act after morphia if the viscid secretion can quickly absorb.— Or will they not act whilst the fluid morphia is on gland —

Keep

Put 2 leaves in pure water for 22' & then took them out, all slimy & dusted them after 2' with dust & splinters of blue glass. When I looked at them after interval of 14' many tentacles inflected & some had reached centre.

p. E another leaf with water

I then placed leaf in sol. of Acetate of morphia & left it in for 22'— took it out at 9˚ & in a 2' dusted it, as above with blue glass at 9˚ 2'

(no inflection 9˚ 15', 9˚ 30' do, 10˚ 5' do, 10˚ 35' perhaps some inflection over pedicel.

[unrelated]

E

Aug 2d put leaf for 5' in Citrate of Strychnia (2 gr. to 1 oz) & then took out & dusted with blue glass

at 10˚ 48' (put in watch-glass 15.)

at 10˚ 55' dusted with blue-glass.

11˚ 5' I think some inflection.

11˚ 13' great inflection far more than plain water spec. (perhaps the water spec. was not so vigorous.)— Has it made given leaf greater tendency to inflect??

I placed leaf immersed in pure water for 22' took it out & after 2' to allow of some draining dusted it with splinter of blue glass— in 14' a large number of tentacles inflected

N. B. I tried a very pale leaf & the glands were very sensitive to particles of glass & cinders, & when afterward put in Ph. of Amm (1 gr. to 20 oz) to my surprise closed fairly well viz in 40'— I had expected from paleness wd not have closed well.


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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)

File last updated 14 May, 2023